What to expect with CPS in Arizona?

an ex boyfriend of mine created a fake instant messaging account online and IMed my exhusband pretending to be me. He said I was "stoned out of my mind on meth and painkillers somewhere out in LA." and that I "didnt know where my 2 yr old daughter was and that she had walked out an unlocked front door and was walking around some foreign neighborhood" and that I was "having with drug dealers for drugs/money". My ex husband tried to call me but I didnt pick up. He called CPs out of concern and now they have a file open on me. The weekend these IMs were sent was a weekend I was in las vegas for my birthday and my daughter was with a family friend babysitter and we can prove all that. Should I be concerned they will take my baby away?? it wasnt me!! they can drug test me, whatever! I live for my kid. also case worker is calling her daycare and she had a couple bruises a couple months ago from roughhousing with her 3 yr old friend at home. the daycare had called about it. What should I expect - I am super concerned!! my ex husband said he would call my case worker and make a statement that I was being libeled/impersonated. He knows it wasnt me and we both know whom it was!